gdb/config/ns32k/tm-umax.h

   1 /* Definitions to make GDB run on an encore under umax 4.2
   2    Copyright 1987, 1989, 1991, 1993, 1994, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "regcache.h"
  23
  24 /* Need to get function ends by adding this to epilogue address from .bf
  25    record, not using x_fsize field.  */
  26 #define FUNCTION_EPILOGUE_SIZE 4
  27
  28 /* Offset from address of function to start of its code.
  29    Zero on most machines.  */
  30
  31 #define FUNCTION_START_OFFSET 0
  32
  33 /* Advance PC across any function entry prologue instructions
  34    to reach some "real" code.  */
  35
  36 extern CORE_ADDR umax_skip_prologue (CORE_ADDR);
  37 #define SKIP_PROLOGUE(pc) (umax_skip_prologue (pc))
  38
  39 /* Immediately after a function call, return the saved pc.
  40    Can't always go through the frames for this because on some machines
  41    the new frame is not set up until the new function executes
  42    some instructions.  */
  43
  44 #define SAVED_PC_AFTER_CALL(frame) \
  45         read_memory_integer (read_register (SP_REGNUM), 4)
  46
  47 /* Address of end of stack space.  */
  48
  49 #ifndef STACK_END_ADDR
  50 #define STACK_END_ADDR (0xfffff000)
  51 #endif
  52
  53 /* Stack grows downward.  */
  54
  55 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
  56
  57 /* Sequence of bytes for breakpoint instruction.  */
  58
  59 #define BREAKPOINT {0xf2}
  60
  61 /* Amount PC must be decremented by after a breakpoint.
  62    This is often the number of bytes in BREAKPOINT
  63    but not always.  */
  64
  65 #define DECR_PC_AFTER_BREAK 0
  66
  67 /* Say how long (ordinary) registers are.  This is a piece of bogosity
  68    used in push_word and a few other places; REGISTER_RAW_SIZE is the
  69    real way to know how big a register is.  */
  70
  71 #define REGISTER_SIZE 4
  72
  73 /* Number of machine registers */
  74
  75 #define NUM_REGS                25
  76
  77 #define NUM_GENERAL_REGS        8
  78
  79 extern char *ns32k_register_name_32082 (int);
  80 extern char *ns32k_register_name_32382 (int);
  81
  82 #define REGISTER_NAME(REGNUM) ns32k_register_name_32082(REGNUM)
  83
  84 /* Register numbers of various important registers.
  85    Note that some of these values are "real" register numbers,
  86    and correspond to the general registers of the machine,
  87    and some are "phony" register numbers which are too large
  88    to be actual register numbers as far as the user is concerned
  89    but do serve to get the desired values when passed to read_register.  */
  90
  91 #define R0_REGNUM 0             /* General register 0 */
  92 #define FP0_REGNUM 8            /* Floating point register 0 */
  93 #define SP_REGNUM 16            /* Contains address of top of stack */
  94 #define AP_REGNUM FP_REGNUM
  95 #define FP_REGNUM 17            /* Contains address of executing stack frame */
  96 #define PC_REGNUM 18            /* Contains program counter */
  97 #define PS_REGNUM 19            /* Contains processor status */
  98 #define FPS_REGNUM 20           /* Floating point status register */
  99 #define LP0_REGNUM 21           /* Double register 0 (same as FP0) */
 100
 101 /* Total amount of space needed to store our copies of the machine's
 102    register state, the array `registers'.  */
 103 #define REGISTER_BYTES \
 104   ((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \
 105    + 4            * REGISTER_RAW_SIZE(LP0_REGNUM))
 106
 107 /* Index within `registers' of the first byte of the space for
 108    register N.  */
 109
 110 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
 111         LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
 112
 113 /* Number of bytes of storage in the actual machine representation
 114    for register N.  On the 32000, all regs are 4 bytes
 115    except for the doubled floating registers. */
 116
 117 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 118
 119 /* Number of bytes of storage in the program's representation
 120    for register N.  On the 32000, all regs are 4 bytes
 121    except for the doubled floating registers. */
 122
 123 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
 124
 125 /* Largest value REGISTER_RAW_SIZE can have.  */
 126
 127 #define MAX_REGISTER_RAW_SIZE 8
 128
 129 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 130
 131 #define MAX_REGISTER_VIRTUAL_SIZE 8
 132
 133 /* Return the GDB type object for the "standard" data type
 134    of data in register N.  */
 135
 136 #define REGISTER_VIRTUAL_TYPE(N) \
 137         (((N) < FP0_REGNUM) ?                           \
 138                 builtin_type_int :                      \
 139                 ((N) < FP0_REGNUM + 8) ?                \
 140                         builtin_type_float :            \
 141                         ((N) < LP0_REGNUM) ?            \
 142                                 builtin_type_int :      \
 143                                 builtin_type_double)
 144
 145 /* Store the address of the place in which to copy the structure the
 146    subroutine will return.  This is called from call_function.
 147
 148    On this machine this is a no-op, because gcc isn't used on it
 149    yet.  So this calling convention is not used. */
 150
 151 #define STORE_STRUCT_RETURN(ADDR, SP)
 152
 153 /* Extract from an array REGBUF containing the (raw) register state
 154    a function return value of type TYPE, and copy that, in virtual format,
 155    into VALBUF.  */
 156
 157 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 158   memcpy (VALBUF, REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), TYPE_LENGTH (TYPE))
 159
 160 /* Write into appropriate registers a function return value
 161    of type TYPE, given in virtual format.  */
 162
 163 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 164   write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
 165
 166 /* Extract from an array REGBUF containing the (raw) register state
 167    the address in which a function should return its structure value,
 168    as a CORE_ADDR (or an expression that can be used as one).  */
 169
 170 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 171 \f
 172 /* Describe the pointer in each stack frame to the previous stack frame
 173    (its caller).  */
 174
 175 /* FRAME_CHAIN takes a frame's nominal address
 176    and produces the frame's chain-pointer. */
 177
 178 /* In the case of the ns32000 series, the frame's nominal address is the FP
 179    value, and at that address is saved previous FP value as a 4-byte word.  */
 180
 181 #define FRAME_CHAIN(thisframe)  \
 182   (!inside_entry_file ((thisframe)->pc) ? \
 183    read_memory_integer ((thisframe)->frame, 4) :\
 184    0)
 185
 186 /* Define other aspects of the stack frame.  */
 187
 188 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
 189
 190 /* Compute base of arguments. */
 191
 192 #define FRAME_ARGS_ADDRESS(fi)  \
 193   ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
 194         ((fi)->frame) : (read_register (SP_REGNUM) - 4))
 195
 196 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 197
 198 /* Get the address of the enter opcode for this function, if it is active.
 199    Returns positive address > 1 if pc is between enter/exit,
 200    1 if pc before enter or after exit, 0 otherwise. */
 201
 202 extern CORE_ADDR ns32k_get_enter_addr ();
 203
 204 /* Return number of args passed to a frame.
 205    Can return -1, meaning no way to tell.  */
 206
 207 extern int umax_frame_num_args (struct frame_info *fi);
 208 #define FRAME_NUM_ARGS(fi) (umax_frame_num_args ((fi)))
 209
 210 /* Return number of bytes at start of arglist that are not really args.  */
 211
 212 #define FRAME_ARGS_SKIP 8
 213
 214 /* Put here the code to store, into a struct frame_saved_regs,
 215    the addresses of the saved registers of frame described by FRAME_INFO.
 216    This includes special registers such as pc and fp saved in special
 217    ways in the stack frame.  sp is even more special:
 218    the address we return for it IS the sp for the next frame.  */
 219
 220 extern int ns32k_localcount (CORE_ADDR enter_pc);
 221
 222 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)     \
 223 {                                                               \
 224   register int  regmask, regnum;                                \
 225   int           localcount;                                     \
 226   register CORE_ADDR    enter_addr;                             \
 227   register CORE_ADDR    next_addr;                              \
 228                                                                 \
 229   memset (&(frame_saved_regs), '\0', sizeof (frame_saved_regs));        \
 230   enter_addr = ns32k_get_enter_addr ((frame_info)->pc);         \
 231   if (enter_addr > 1)                                           \
 232     {                                                           \
 233       regmask = read_memory_integer (enter_addr+1, 1) & 0xff;   \
 234       localcount = ns32k_localcount (enter_addr);               \
 235       next_addr = (frame_info)->frame + localcount;             \
 236       for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)     \
 237         (frame_saved_regs).regs[regnum] = (regmask & 1) ?       \
 238                                           (next_addr -= 4) : 0; \
 239       (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
 240       (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
 241       (frame_saved_regs).regs[FP_REGNUM] =                      \
 242                   (read_memory_integer ((frame_info)->frame, 4));\
 243     }                                                           \
 244   else if (enter_addr == 1)                                     \
 245     {                                                           \
 246       CORE_ADDR sp = read_register (SP_REGNUM);                 \
 247       (frame_saved_regs).regs[PC_REGNUM] = sp;                  \
 248       (frame_saved_regs).regs[SP_REGNUM] = sp + 4;              \
 249     }                                                           \
 250 }
 251 \f
 252 /* Things needed for making the inferior call functions.  */
 253
 254 /* Push an empty stack frame, to record the current PC, etc.  */
 255
 256 #define PUSH_DUMMY_FRAME \
 257 { register CORE_ADDR sp = read_register (SP_REGNUM);\
 258   register int regnum;                              \
 259   sp = push_word (sp, read_register (PC_REGNUM));   \
 260   sp = push_word (sp, read_register (FP_REGNUM));   \
 261   write_register (FP_REGNUM, sp);                   \
 262   for (regnum = 0; regnum < 8; regnum++)  \
 263     sp = push_word (sp, read_register (regnum));    \
 264   write_register (SP_REGNUM, sp);                       \
 265 }
 266
 267 /* Discard from the stack the innermost frame, restoring all registers.  */
 268
 269 #define POP_FRAME  \
 270 { register struct frame_info *frame = get_current_frame ();      \
 271   register CORE_ADDR fp;                                         \
 272   register int regnum;                                           \
 273   struct frame_saved_regs fsr;                                   \
 274   struct frame_info *fi;                                                 \
 275   fp = frame->frame;                                             \
 276   get_frame_saved_regs (frame, &fsr);                            \
 277   for (regnum = 0; regnum < 8; regnum++)                         \
 278     if (fsr.regs[regnum])                                        \
 279       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 280   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 281   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 282   write_register (SP_REGNUM, fp + 8);                            \
 283   flush_cached_frames ();                                        \
 284 }
 285
 286 /* This sequence of words is the instructions
 287    enter        0xff,0          82 ff 00
 288    jsr  @0x00010203     7f ae c0 01 02 03
 289    adjspd       0x69696969      7f a5 01 02 03 04
 290    bpt                  f2
 291    Note this is 16 bytes.  */
 292
 293 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
 294
 295 #define CALL_DUMMY_START_OFFSET 3
 296 #define CALL_DUMMY_LENGTH       16
 297 #define CALL_DUMMY_ADDR         5
 298 #define CALL_DUMMY_NARGS        11
 299
 300 /* Insert the specified number of args and function address
 301    into a call sequence of the above form stored at DUMMYNAME.  */
 302
 303 void flip_bytes (void *ptr, int count);
 304
 305 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)            \
 306 {                                                               \
 307         int     flipped;                                        \
 308         flipped = fun | 0xc0000000;                             \
 309         flip_bytes (&flipped, 4);                               \
 310         *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped;    \
 311         flipped = - nargs * 4;                                  \
 312         flip_bytes (&flipped, 4);                               \
 313         *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped;   \
 314 }